Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified face model algorithm" » "modified face mom algorithm", "modified male model algorithm", "modified traces model algorithm", "modified orca model algorithm", "modified force model algorithm", "modified space model algorithm", "modified five model algorithm"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified face model algorithm") OR ("modified notion approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified face model algorithm ) or ( modified notion approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified face model algorithm") or ("modified notion approximation algorithms"))*.